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 ###Instrução: Quem obteve a pole position se o suporte for a USAC National Midget Series?
 ###Tabelas: CREATE TABLE 1970_isle_of_man_lightweight_tt_125cc_final_standings (1970_isle_of_man_lightweight_tt_125cc_final_standings_id AUTO_INCREMENT PRIMARY KEY, Place INT, Rider VARCHAR, Country VARCHAR, Machine VARCHAR, Speed VARCHAR, Time VARCHAR, Points INT) CREATE TABLE race_calendar_and_results (race_calendar_and_results_id AUTO_INCREMENT PRIMARY KEY, Round INT, Circuit VARCHAR, Location VARCHAR, Date VARCHAR, Pole position VARCHAR, Fastest lap VARCHAR, Winning driver VARCHAR, Winning team VARCHAR, Supporting VARCHAR) CREATE TABLE negotiation_progress (negotiation_progress_id AUTO_INCREMENT PRIMARY KEY, Screening Started VARCHAR, Screening Completed VARCHAR, Chapter Unfrozen VARCHAR, Chapter Opened VARCHAR, Chapter Closed VARCHAR) CREATE TABLE week_8_july_30_2008 (week_8_july_30_2008_id AUTO_INCREMENT PRIMARY KEY, Couple VARCHAR, Style VARCHAR, Music VARCHAR, Choreographer(s) VARCHAR, Results VARCHAR) CREATE TABLE closed_landfills (closed_landfills_id AUTO_INCREMENT PRIMARY KEY, Landfill VARCHAR, Location VARCHAR, Acres INT, Opened INT, Capacity VARCHAR, Status VARCHAR, Rehab Period VARCHAR)  
SELECT Pole position FROM race_calendar_and_results WHERE Supporting = USAC National Midget Series